Question
Chemistry Question on d -and f -Block Elements
The correct order of decreasing second ionisation enthalpy of Ti(22), V(23), Cr(24) and Mn(25) is
A
Cr > Mn > V > Ti
B
V > Mn > Cr > Ti
C
Mn > Cr > Ti > V
D
Ti > V > Cr > Mn
Answer
Cr > Mn > V > Ti
Explanation
Solution
The amount of energy required to remove an
electron from unipositive ion is referred as second
ionisation potential.
In Ti, V, Cr and Mn, generally second ionisation
energy increases with increase in atomic number
but second ionisation potential of Cr is greater than
that of Mn due to the presence of exactly half-filled
d-subshell in Cr.
Thus, the order of second ionisation enthalpy is
\hspace20mm Cr > Mn > V > Ti